#include <stdio.h>
#include <iostream>
#include <cmath>
#include "test2.2.h"
using namespace std;
int main()
{
   
    double x;
    x = sqrt(6.25);
    int a;
    xx(a);

    int num;
    cout << "num test" << endl;
    cout << "x:" << x << endl;
    // cin >> num;
    num = num + 2;
    cout << "result:" << num << endl;
}
void xx(int &a)
{
    a = 0;
    cout << "str1";
    cout << a;
    cout << "str2";
    cout << endl;
    a = a + 1;
    cout << "str3" << a << "str4" << endl;
}